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Questions and Answers
What is the order of magnitude of the voltage produced between ECG leads due to the largest action potentials in the body?
What is the order of magnitude of the voltage produced between ECG leads due to the largest action potentials in the body?
- 100mV
- 0.1mV
- 1mV (correct)
- 10mV
How are the action potentials in the heart measured externally?
How are the action potentials in the heart measured externally?
- Using external electrodes (correct)
- Through ultrasound imaging
- By measuring temperature changes
- By analyzing blood samples
What do the measurable voltages at the skin resulting from heart action potentials represent?
What do the measurable voltages at the skin resulting from heart action potentials represent?
- Measurement of blood pressure changes
- Direct measurement of body-produced voltages (correct)
- Representation of skin sensitivity
- Indirect measurement of muscle contractions
Which area of the heart can act as a pacemaker if the SA node and AV node are not working?
Which area of the heart can act as a pacemaker if the SA node and AV node are not working?
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At what rate do the His-Purkinje cells normally contract?
At what rate do the His-Purkinje cells normally contract?
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If the SA node is not working, which area of the heart will act as the pacemaker?
If the SA node is not working, which area of the heart will act as the pacemaker?
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